Troubleshooting - VWR 250V Manual De Instrucciones

Troubleshooting

Review the information in the table below to troubleshoot operating problems.
Problem Cause
The LCD screen AC power cord is not
remains blank and connected
the fan does not run The fuse has blown
when the power is
turned on
Operation stops Electrophoresis leads are
with alarm: not connected to the power
The screen displays supply or to the
"NO LOAD"
electrophoresis unit(s), or
there is a broken circuit in
the electrophoresis cell
High resistance due to tape
left on a pre-cast gel,
incorrect buffer
concentration, or incorrect
buffer volumes in the
electrophoresis cell
High voltage application is
set to run on a very low
current
Operation stops Circuit is interrupted
with alarm:
Display shows
"OVER VOLTAGE"
Operation stops Ground leak detected
with alarm: during run
Display shows
"LEAKAGE"
Solution
Check AC power cord connections at both
ends. Use the correct cords.
Replace the fuse
Check the connections to the power supply
and on your electrophoresis cell to make
sure the connection is intact; check condition
of wires in electrophoresis unit. Close the
circuit by reconnecting the cables. Press
START/PAUSE to restart the run.
Correct the condition by making sure the
tape is removed from the pre-cast gel,
buffers are prepared
correctly, and the recommended volume of
buffer is added to the electrophoresis unit.
DISABLE No Load alarm on the
Display Screen
•
Verify that the running buffer is correct.
•
Verify the all cables are attached correctly
•
Turn the Power switch off and on again;
restart application.
•
If you cannot restart the
instrument, turn off the power, disconnect
the power cord from the outlet, and contact
Technical Service.
Check the electrophoresis system for
improper grounding. Restart the power
supply by turning the Power
switch off and on.
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